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COLUMBIA, Md. (AP) - Police say they have found the Maryland mall gunman's journal and it expresses some general unhappiness, but they say they still are not sure of a motive in the shooting.

Howard County Police Chief William McMahon said Sunday night that they had taken the journal from Darion Marcus Aguliar's house, but he did not give any specifics about what it contained.

He says they are still interviewing friends and family of the gunman and the victims, but authorities are not sure yet whether they knew each other.

Aguliar killed two people at the Mall in Columbia on Saturday before turning the gun on himself. Police say he was armed with a shotgun, plenty of ammunition and a backpack filled with crude homemade explosives.

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Police say a 19-year-old from suburban Washington was the gunman in yesterday's deadly shootings at a Maryland shopping mall.

Police say Darion Marcus Aguilar (AG'-uh-lahr) of College Park, Md., used a 12-gauge shotgun to kill two people at a store in the Mall in Columbia before killing himself. They say it took hours to identify the shooter since he was carrying ammunition and a backpack containing crude homemade explosives.

Police say officers found more ammunition and other evidence when they searched Aguilar's home last night.

Howard County Police Chief William McMahon says there are still "a lot of unanswered questions," including a motive. He says investigators are trying to determine whether Aguilar knew either of the victims and whether he had a criminal record.

The victims have been identified as 21-year-old Brianna Benlolo of College Park, Md., and 25-year-old Tyler Johnson of Ellicott City, Md. Both worked at a skateboard shop called Zumiez (ZOO'-meez).

Police searched the mall with dogs overnight. The stores will remain closed through Tuesday.-------------------Previous story:

Police say they are still trying to determine the identity of a gunman who killed two employees of a store at a Maryland shopping mall. The gunman also died.

The attack took place at a skateboard shop called Zumiez on the upper level of the Mall in Columbia, a suburb of both Baltimore and Washington, according to Howard County Police Chief William J. McMahon.

McMahon said authorities ran into difficulty in identifying the gunman because of concerns that he might be carrying explosives.

The two victims were a man and a woman, both in their 20s. They were employees of the shop where the attack occurred. Their names were not released.

Five other people were injured, none seriously.

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UPDATE: Police say they don't think there are any more victims at a Maryland mall where three people were shot dead today, but they're checking to make sure.

The Mall in Columbia remains closed to the public as police go store to store looking for people who might still be hiding.

Police believe the gunman is among the dead.

Two people were taken to a hospital with minor injuries.

There's no word yet on a possible motive. Police say they don't know whether the shooting was random or whether the shooter and victims knew each other.

---------------------------- Police in Maryland say three people are dead in a shooting at a mall in suburban Baltimore.

Police say they believe the shooter is among the dead.

Howard County police said via Twitter that the scene is now "believed to be secure."

The shooting happened at the Mall in Columbia, a suburb between Baltimore and Washington.

Authorities received a call to 911 at around 11:15 a.m. from someone reporting that shots had been fired. Police responded to the scene and found three people dead, including one person who was found near a gun and ammunition.

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